Pros/Cons of is_numeric()

is_numeric.md

is_numeric()

is_numeric() is a conditional that tests if the value passed is numeric and returns false if not.

Cons:

• Does not do any sanitization of the input value
• Will return true for values that could never or would never be a ID of a WordPress core object such as decimals (see truthy values below).
• WordPress does not consistently create false cases for testing the results of any is_numeric condition tests thus no feedback upon failure.

Values is_numeric() considered valid:

• +0123.45e6
• 12.3456
• 12345

Pros:

1. is_numeric allows for the creation of a false condition whereby the function testing the condition could be notified of a false condition and adjust accordingly.
2. Since is_numeric is a function, it can be passed to a function as a parameter that accepts functions such as array_map(‘is_numeric’, $array) for validation purposes.